Sendle doesn't offer a set list of services for you to enable or disable as required. Services are automatically returned based on the matching criteria with your shipping origin and destination.
Add the following code to your configuration file under the providers array, as per the below. Note that to disable certain services, simply omit them from the services array.
'providers' => [
'sendle' => [
'name' => 'Sendle',
'settings' => [
'sendleId' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'apiKey' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
],
],
]